docs: def fill_x509_issuer_name(self, x509_issuer_serial):
          """
          Fills the X509IssuerSerial node
          :param x509_issuer_serial: X509IssuerSerial node
          :type x509_issuer_serial: lxml.etree.Element
          :return: None
          """
          x509_issuer_name = x509_issuer_serial.find(
              'ds:X509IssuerName', namespaces=constants.NS_MAP
          )
          if x509_issuer_name is not None:
              x509_issuer_name.text = get_rdns_name(self.x509.issuer.rdns)
          x509_issuer_number = x509_issuer_serial.find(
              'ds:X509SerialNumber', namespaces=constants.NS_MAP
          )
          if x509_issuer_number is not None:
              x509_issuer_number.text = str(self.x509.serial_number)